purge troubles

[zpromax777]

Hi all. Have a small, but frustrating problem. The purge plate on my air dryer will stick open. Truck is A2 with ABS and HALDEX N50011F air dryer. I pulled the snap rings and bottom cover off and O rings are ok and clean. Valve will blow/ pulse , especially on narrow road or traffic. A quick bump with a nut driver end and I am back on my way. Does This happen to anybody else

 

[juanprado]

Yes, it is common. the piston will stick. There is a lower rebuild kit. Clean and hone bore plus lube the o ring. Many have also replaced with a more modern design. Plenty of choices out there in the civy world. Ours does have a 24v heater so I don't know the weather in your parts so that could be a consideration to have a 24v compatible heater. Search on here as many threads on rebuild and conversions on the m939 platform.

If you do rebuild, change the cartridge also.

 

[Mullaney]

Hi all. Have a small, but frustrating problem. The purge plate on my air dryer will stick open. Truck is A2 with ABS and HALDEX N50011F air dryer. I pulled the snap rings and bottom cover off and O rings are ok and clean. Valve will blow/ pulse , especially on narrow road or traffic. A quick bump with a nut driver end and I am back on my way. Does This happen to anybody else

.
And often times, your hand (flat palm) on the bottom of the dryer will also do the same thing (fix your leak). Rebuilding and cleaning like @juanprado mentioned should solve the problem. Cleanliness is next to Godliness in your air system!